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5 – Experimental Results Due to the relatively small temperature difference, the curves at 33/28°C and 35/30°C supply/return temperatures for the space heating system were virtually coincident. Moreover, the lower the hot water temperature, the steeper the average gradient (∂∆TA/∂pGC), where ∆TA is the temperature approach and pGC the gas cooler (high-side) pressure. The Heating Capacity of the Tripartite Gas Cooler Despite the relatively large variations in the set-point temperatures for the space heating and hot water systems, the total heating capacity of the tripartite gas cooler at optimum high-side pressure did not change much, and ranged from about 6.4 to 7.2 kW (6.8 kW ±6%). Figure 5.24 shows the relative heating capacity for each of the three gas cooler units at optimum high-side pressure and varying temperature levels in the space heating and hot water systems. The numbers above the columns represent the DHW heating capacity ratio in percent for the CO2 heat pump unit. 1.0 49.4% 0.8 0.6 0.4 0.2 0.0 57.4% Max. 43.1% 69.3% 43.3% 62.0% Min. 39.4% 31.4% 51.9% DHW-preheating DHW-reheating Space heating Figure 5.24 The measured relative heating capacity for the three gas cooler units at optimum high-side pressure and varying temperature levels in the SH and DHW systems. 131 Relative Heating Capacity [-] 60°C, 33/28°C 60°C, 35/30°C 60°C, 40/35°C 70°C, 33/28°C 70°C, 35/30°C 70°C, 40/35°C 80°C, 33/28°C 80°C, 35/30°C 80°C, 40/35°CPDF Image | Residential CO2 Heat Pump System for Combined
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